Kenwood TK-885 Service Manual

Also see for TK-885: Instruction manual Service manual

Contents

8TK-885 INSTALLATION2. Accessory Terminal (TX-RX Unit)2-1. External Connector Accessory Terminal MethodConnector Pin Pin I/O FunctionNo. No. nameCN1 1 DEO O Detect signal output. (Output level :250mVrms; standard modulation)2 AHK I No function.3 IGN I Ignition sense input.4 DI I External modulation signal input.5 ME – MIC earth.AM I Audio mute signal input.6 MI I Internal MIC input.TXS O No function.7 PTT I No function.8 SQ O No function.CN2 1 AM I Audio mute signal input.LOK O No function.2 MM I MIC mute input.3 DTC I No function.TXS O No function.FSW I Foot switch signal input.Foot sw on : L, Foot sw off : HLOK O No function.CN3 1 HOR O Horn alert signal output. Signaloutput for horn relay drive (opencollector). L level during horn drive :Max. sink current 100mA.L level when AUX A is on.2 E – Earth.3 SB O Power output after power switch(DC 13.6V± 15%, 0.75A max.).CN4 1 LOK O No function.2 RXD I Serial data input 1.3 TXD O Serial data output 1.CN5 1 PA O Relay for PA function in KAP-1control signal. PA on : H, PA off : L2 SPO O Audio signal input from KAP-1.3 SPI I Audio signal output to KAP-1.CN6 1 SP O Output for internal/external speaker.2 E – Earth.3. Optional Board TerminalTerminal is for mounting the option board are provided atthe control and TX-RX unit. The table below shows the cor-respondence between the board and terminals. DisconnectR529 and R571 in control unit when the scrambler board isattached.The table below shown the differences between theschematic terminals and the PC board terminals.Schematic diagram PC board viewName I/O Function Name UnitSB O Switched B+ (13.6V, 0.75A) SB TX-RX5C O 5C 5C TX-RXGND – Earth E TX-RXDEO O Detect signal output (Output DEO TX-RXlevel : 250mVrms; standardmodulation)RXAI I RX audio input RXAI ControlRXAO O RX audio output RXAO ControlTXAI I TX audio input TXAI ControlTXAO O TX audio output TXAO ControlLOK O No function LOK TX-RXOPT O Option board select. OP TX-RXCODE1 O Option code 1 (for voice C1 TX-RXscrambler code 1)CODE2 O Option code 1 (for voice C2 TX-RXscrambler code 2)CODE3 O Option code 1 (for voice C3 TX-RXscrambler code 3)CODE4 O Option code 1 (for voice C4 TX-RXscrambler code 4)SQ O No function SQ TX-RXTXD1 O Serial data output 1 TD1 TX-RXRXD1 I Serial data input 1 RD1 TX-RXTXD2 O Serial data output 2 TD2 TX-RXRXD2 I Serial data input 2 RD2 TX-RXRSSI O Receive signal strength indication RSSI TX-RXPTT I PTT PTT ControlMPTT I MIC PTT MPTT ControlFSW I Foot switch input FW TX-RX